t the impossible. Why? For placed against a mercury bath during the exposure. the simple reason that we are attempting an advanced After developing, the original colors of the object are stage of progress before we have attained elementary seen by reflection. The nature of the sensitive layer… … perimentaticn when we come to test our ap- tion is kept up with the iodide of silver which paratus. Such is the erratic behavior of the is formed in this case, but the film still remains the Apparatus Held Perfectly Horizontal. transparent, and the iodide seems to be in the wind that it entirely…
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